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CVE-2026-14456

Published
CVSS7.5
Severityhigh
WeaknessCWE-770
ExploitedNot in CISA KEV

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

Issue summary: When an OpenSSL QUIC server (Listener SSL object) processes valid QUIC Initial packets for unknown destination connection IDs, it can allocate and queue new incoming channels without enforcing any limit. Impact summary: A remote peer that can make many Initial packets reach the server listener faster than the application accepts connections, can cause the memory allocated to store the per-channel state to grow without any limits, potentially making the QUIC listener unavailable and causing Denial of Service. CWE: CWE-770: Allocation of Resources Without Limits or Throttling Description: The function that handles inbound QUIC packets uses Connection-Id from the packet header

References

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Our coverage of CVE-2026-14456

CVE-2026-14456high

CDN Tsunami Attack Abuses HTTP/3 Translation for Up to 350x DoS Amplification

New research has revealed a pair of denial-of-service (DoS) attack techniques, collectively termed "CDN Tsunami," that leverage the protocol translation mechanisms within major content delivery networks. These methods exploit the process by which CDNs convert HTTP/3 requests into HTTP/1.1 for communication with origin servers, enabling attackers to amplify relatively small requests into…